The app goes through the user's friends list, saving their profile pictures. Then, it randomly chooses a photo and distorts it, leaving players to guess who that friend is. The faster they guess, the more points they gain.

4 different game modes are available, offering different levels of difficulty. Alongside that are numerous distortion effects, as well as the ability to share scores worldwide.

Facetrainer is a distinctly casual affair but it's fun to test just how well players know their friends, especially if they have hundreds of friends on the network. Once guessed, they can even post the distorted images to their Facebook wall to share with friends.